Most rehabilitation protocols use a splint in which the wrist position is kept straight (neutral) or bent (flexed). Some groups have described splinting with the wrist cocked back (extended) and have made the argument that this may improve outcomes, as experimental data suggests that splinting the hand with the wrist extended increases the range of movement of the repaired flexor tendon (excursion), and therefore reduces the chance of the tendon sticking down to the surrounding tissues (adhesion). Previous studies have shown no adverse effects from splinting hands with the wrist extended, and no evidence tells us which wrist splint position is better (a state of clinical equipoise or apparently equivalent outcomes). This randomised trial aims to produce this evidence, and therefore improve functional outcomes for patients in future.